Superheater for Waste Heat Waste Heat Boiler and Superheated Steam Heating Method

Abstract

The invention discloses a superheater for waste incineration waste heat boiler and a superheated steam heating method. The superheater comprises a plurality of superheater subunits. Each superheater subunit comprises an inlet mixer, an outlet mixer and a plurality of U-shaped superheating pipes connected between the inlet mixer and the outlet mixer in parallel. The superheater subunits are arranged in sequence, and the outlet mixers of the previous superheater subunits are connected with the inlet mixers of the next superheater subunits through a plurality of crossing temperature equilibrium pipes. The superheater is convenient to manufacture and short in pipe pass; the steam flow in all the pipes and evenness of the flow speed can be improved, and the pipe temperature of all parts tends to be balanced; and the situation that corrosion is accelerated by too high temperature of the pipes, and consequently the pipes explode can be avoided, and long-time stable running of the boiler is facilitated.

Description

technical field [0001] The invention relates to a superheater and a superheated steam heating method, in particular to a superheater and a superheated steam heating method for waste heat waste incineration boilers. Background technique [0002] In the 21st century, with the improvement of people's living standards, the amount of garbage generated is also increasing. Many large cities have formed a dilemma surrounded by garbage, and the problem of garbage treatment and disposal has been placed before us. Incineration power generation is the most effective way to deal with urban domestic waste. It can not only achieve the purpose of reducing the volume to the greatest extent, but also the flue gas can meet the environmental protection standards stipulated by the state after treatment, so as not to cause secondary pollution. The heat energy released by waste incineration It can also be used to reduce the use of coal and reduce carbon emissions. Waste incineration power generat...

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Problems solved by technology

[0014] Conventional superheaters such as figure 2 , image 3 As shown, it includes an inlet mixer 7, an outlet mixer 8, and several serpentine tubes 9 connected in parallel between the inlet mixer 7 and the outlet mixer 8. The serpentine tubes 9 are heated by the flue gas while heating the superheated steam in the tube. ; When in use, the superheated steam is introduced from the inlet mixer 7, and is discharged from the outlet mixer 8 after being heated by several serpentine tubes 9 in the flue; 9 has a long tube length and many elbows, which is not only difficult to process, but also has a large error in manufacturing accuracy. In particular, it is difficult to ensure a uniform cross-section inside the tube. In the process of heating superheated steam, it is impossible to completely guarantee the steam in each tube. The flow rate is equal and the flow rate is balanced. Therefore, due to the low steam flow rate of some serpentine tubes 9, the temperature of the tube wall at the local position is high. Due to the long tube path, the steam temperature deviation will gradually superimpose, and the accumulation will increase, resulting in local metal on the heating surface tube. The temperature is higher than other areas, and the deviation is large, which accelerates the high-temperature corrosion in this local area, and eventually the phenomenon of superheater tube burst occurs, and the long-term stable operation of the boiler cannot be guaranteed.

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